978907 has 2 divisors, whose sum is σ = 978908. Its totient is φ = 978906.

The previous prime is 978883. The next prime is 978917. The reversal of 978907 is 709879.

It is a strong prime.

It is an emirp because it is prime and its reverse (709879) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-978907 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 978907.

It is not a weakly prime, because it can be changed into another prime (978917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 489453 + 489454.

It is an arithmetic number, because the mean of its divisors is an integer number (489454).

2⁹⁷⁸⁹⁰⁷ is an apocalyptic number.

978907 is a deficient number, since it is larger than the sum of its proper divisors (1).

978907 is an equidigital number, since it uses as much as digits as its factorization.

978907 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 31752, while the sum is 40.

The square root of 978907 is about 989.3972912839. The cubic root of 978907 is about 99.2918977469.

The spelling of 978907 in words is "nine hundred seventy-eight thousand, nine hundred seven".